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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /ipc/compat_mq.c
downloadlinux-linaro-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'ipc/compat_mq.c')
-rw-r--r--ipc/compat_mq.c146
1 files changed, 146 insertions, 0 deletions
diff --git a/ipc/compat_mq.c b/ipc/compat_mq.c
new file mode 100644
index 000000000000..d8d1e9ff4e88
--- /dev/null
+++ b/ipc/compat_mq.c
@@ -0,0 +1,146 @@
+/*
+ * ipc/compat_mq.c
+ * 32 bit emulation for POSIX message queue system calls
+ *
+ * Copyright (C) 2004 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author: Arnd Bergmann <arnd@arndb.de>
+ */
+
+#include <linux/compat.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/mqueue.h>
+#include <linux/syscalls.h>
+
+#include <asm/uaccess.h>
+
+struct compat_mq_attr {
+ compat_long_t mq_flags; /* message queue flags */
+ compat_long_t mq_maxmsg; /* maximum number of messages */
+ compat_long_t mq_msgsize; /* maximum message size */
+ compat_long_t mq_curmsgs; /* number of messages currently queued */
+ compat_long_t __reserved[4]; /* ignored for input, zeroed for output */
+};
+
+static inline int get_compat_mq_attr(struct mq_attr *attr,
+ const struct compat_mq_attr __user *uattr)
+{
+ if (!access_ok(VERIFY_READ, uattr, sizeof *uattr))
+ return -EFAULT;
+
+ return __get_user(attr->mq_flags, &uattr->mq_flags)
+ | __get_user(attr->mq_maxmsg, &uattr->mq_maxmsg)
+ | __get_user(attr->mq_msgsize, &uattr->mq_msgsize)
+ | __get_user(attr->mq_curmsgs, &uattr->mq_curmsgs);
+}
+
+static inline int put_compat_mq_attr(const struct mq_attr *attr,
+ struct compat_mq_attr __user *uattr)
+{
+ if (clear_user(uattr, sizeof *uattr))
+ return -EFAULT;
+
+ return __put_user(attr->mq_flags, &uattr->mq_flags)
+ | __put_user(attr->mq_maxmsg, &uattr->mq_maxmsg)
+ | __put_user(attr->mq_msgsize, &uattr->mq_msgsize)
+ | __put_user(attr->mq_curmsgs, &uattr->mq_curmsgs);
+}
+
+asmlinkage long compat_sys_mq_open(const char __user *u_name,
+ int oflag, compat_mode_t mode,
+ struct compat_mq_attr __user *u_attr)
+{
+ void __user *p = NULL;
+ if (u_attr && oflag & O_CREAT) {
+ struct mq_attr attr;
+ p = compat_alloc_user_space(sizeof(attr));
+ if (get_compat_mq_attr(&attr, u_attr) ||
+ copy_to_user(p, &attr, sizeof(attr)))
+ return -EFAULT;
+ }
+ return sys_mq_open(u_name, oflag, mode, p);
+}
+
+static int compat_prepare_timeout(struct timespec __user * *p,
+ const struct compat_timespec __user *u)
+{
+ struct timespec ts;
+ if (!u) {
+ *p = NULL;
+ return 0;
+ }
+ *p = compat_alloc_user_space(sizeof(ts));
+ if (get_compat_timespec(&ts, u) || copy_to_user(*p, &ts, sizeof(ts)))
+ return -EFAULT;
+ return 0;
+}
+
+asmlinkage long compat_sys_mq_timedsend(mqd_t mqdes,
+ const char __user *u_msg_ptr,
+ size_t msg_len, unsigned int msg_prio,
+ const struct compat_timespec __user *u_abs_timeout)
+{
+ struct timespec __user *u_ts;
+
+ if (compat_prepare_timeout(&u_ts, u_abs_timeout))
+ return -EFAULT;
+
+ return sys_mq_timedsend(mqdes, u_msg_ptr, msg_len,
+ msg_prio, u_ts);
+}
+
+asmlinkage ssize_t compat_sys_mq_timedreceive(mqd_t mqdes,
+ char __user *u_msg_ptr,
+ size_t msg_len, unsigned int __user *u_msg_prio,
+ const struct compat_timespec __user *u_abs_timeout)
+{
+ struct timespec __user *u_ts;
+ if (compat_prepare_timeout(&u_ts, u_abs_timeout))
+ return -EFAULT;
+
+ return sys_mq_timedreceive(mqdes, u_msg_ptr, msg_len,
+ u_msg_prio, u_ts);
+}
+
+asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
+ const struct compat_sigevent __user *u_notification)
+{
+ struct sigevent __user *p = NULL;
+ if (u_notification) {
+ struct sigevent n;
+ p = compat_alloc_user_space(sizeof(*p));
+ if (get_compat_sigevent(&n, u_notification))
+ return -EFAULT;
+ if (n.sigev_notify == SIGEV_THREAD)
+ n.sigev_value.sival_ptr = compat_ptr(n.sigev_value.sival_int);
+ if (copy_to_user(p, &n, sizeof(*p)))
+ return -EFAULT;
+ }
+ return sys_mq_notify(mqdes, p);
+}
+
+asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
+ const struct compat_mq_attr __user *u_mqstat,
+ struct compat_mq_attr __user *u_omqstat)
+{
+ struct mq_attr mqstat;
+ struct mq_attr __user *p = compat_alloc_user_space(2 * sizeof(*p));
+ long ret;
+
+ if (u_mqstat) {
+ if (get_compat_mq_attr(&mqstat, u_mqstat) ||
+ copy_to_user(p, &mqstat, sizeof(mqstat)))
+ return -EFAULT;
+ }
+ ret = sys_mq_getsetattr(mqdes,
+ u_mqstat ? p : NULL,
+ u_omqstat ? p + 1 : NULL);
+ if (ret)
+ return ret;
+ if (u_omqstat) {
+ if (copy_from_user(&mqstat, p + 1, sizeof(mqstat)) ||
+ put_compat_mq_attr(&mqstat, u_omqstat))
+ return -EFAULT;
+ }
+ return 0;
+}